A New Functional Global Auto-ignition Model for Hydrocarbon Fuels - Part 2 of 2: Model Formulation, Development and Performance Assessment

Floweday, Gareth

doi:10.4271/2010-01-2169

Cited by 5 publications

(7 citation statements)

References 35 publications

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“…Generally, the cool flame heat release tends to be slightly too high, especially prior to ignition. As pointed out by Flowday [58], who developed a similar model, using however a slightly different approach based on surrogate fuels, the introduction of a second reversible reaction might be necessary to control the cool flame ignition delay and heat release independently. The present optimisation seems to support this statement, as it was found that low values for f LT and hence good ignition delay predictions compete with low values of f p LT indicating good cool flame heat release predictions.…”

Section: Assessment Of Species and Heat Release Evolutions For Homogementioning

confidence: 96%

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Global reaction mechanism for the auto-ignition of full boiling range gasoline and kerosene fuels

Vandersickel¹,

Wright²,

Boulouchos³

2013

Combustion Theory and Modelling

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Compact reaction schemes capable of predicting auto-ignition are a prerequisite for the development of strategies to control and optimise homogeneous charge compression ignition (HCCI) engines. In particular for full boiling range fuels exhibiting two stage ignition a tremendous demand exists in the engine development community. The present paper therefore meticulously assesses a previous 7-step reaction scheme developed to predict auto-ignition for four hydrocarbon blends and proposes an important extension of the model constant optimisation procedure, allowing for the model to capture not only ignition delays, but also the evolutions of representative intermediates and heat release rates for a variety of full boiling range fuels. Additionally, an extensive validation of the later evolutions by means of various detailed n-heptane reaction mechanisms from literature has been presented; both for perfectly homogeneous, as well as nonpremixed/stratified HCCI conditions. Finally, the models potential to simulate the autoignition of various full boiling range fuels is demonstrated by means of experimental shock tube data for six strongly differing fuels, containing e.g. up to 46.7% cycloalkanes, 20% napthalenes or complex branched aromatics such as methyl-or ethylnapthalene. The good predictive capability observed for each of the validation cases as well as the successful parameterisation for each of the six fuels, indicate that the model could, in principle, be applied to any hydrocarbon fuel, providing suitable adjustments to the model parameters are carried out. Combined with the optimisation strategy presented, the model therefore constitutes a major step towards the inclusion of real fuel kinetics into full scale HCCI engine simulations.

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Section: Assessment Of Species and Heat Release Evolutions For Homogementioning

confidence: 96%

“…As pointed out for other global reaction mechanisms [58], the parameter sets should be considered as fuel specific solution sets rather than individual chemically representative values.…”

Section: Optimisation Proceduresmentioning

confidence: 99%

Global reaction mechanism for the auto-ignition of full boiling range gasoline and kerosene fuels

Vandersickel¹,

Wright²,

Boulouchos³

2013

Combustion Theory and Modelling

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“…The combustion chamber was split into many annular zones in order to take into account the spacial variation of unburnt gas properties. Floweday's [22] rate-based global auto-ignition model for reaction modelling and auto-ignition prediction was then applied to each zone respectively. The difficulty arose in assigning initial properties to each individual zone.…”

Section: Engine Modellingmentioning

confidence: 99%

A CFD Study of Fuel Evaporation and Related Thermo-fluid Dynamics in the Inlet Manifold, Port and Cylinder of the CFR Octane Engine

Thiart¹,

Floweday²,

Meyer³

2012

SAE Int. J. Fuels Lubr.

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“…24,25 An overview of ignition delay models used for HCCI, diesel, reactivity controlled compression ignition (RCCI) and partial premixed compression ignition (PPCI) engines with the focus on controls is provided in the literature, 25 and more information on global ignition delay models in general can be found in Floweday. 26,27 For engine controls, simple combustion models such as the Wiebe 28 function are generally used due to its simplicity and low computational cost. Ghojel 29 utilized a Wiebe function for engine controls; however, recalibration for each operating parameter was necessary as it has no connection to physical processes.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A control-oriented combustion model framework for compression ignition engines operating on low-reactivity fuel

Pamminger

Hall

Wang

et al. 2020

International Journal of Engine Research

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This work focuses on zero-dimensional modeling of the heat release rate in a compression ignition engine operating on gasoline-like fuels. Due to the properties of gasoline, such as high volatility and longer ignition delay than diesel, the injection strategies can vary significantly from the operation with conventional diesel fuel. Different injection strategies are commonly used to achieve varying degrees of in-cylinder stratification in order to shape the combustion event and maximize efficiency. The proposed zero-dimensional combustion model was developed to account for the different stages in combustion caused by the fuel stratification. As the ignition delay model is an integral part of the entire combustion process and significantly affects the prediction accuracy, special attention has been paid to local phenomena influencing ignition delay. A one-dimensional spray model by Musculus and Kattke was employed in conjunction with a Lagrangian tracking approach in order to estimate the local air–fuel ratio within the spray tip, as a proxy for reactivity. The local air–fuel ratio, in-cylinder temperature and pressure were used in an integral fashion to estimate the ignition delay. Heat release rates were modeled using first-order non-linear differential equations. The proposed combustion model was validated against experimental data of a heavy-duty compression ignition engine with up to three injection events at mostly 1038 r/min and 14 bar brake mean effective pressure. Further validation of the model was carried out at other engine loads and speeds. Model prediction errors in CA50 of less than 1 °CA across all conditions were found. Modeling results of other combustion metrics such as combustion duration and indicated mean effective pressure are also highly satisfactory. In addition, the model has been shown to be capable of estimating the ringing intensity for most conditions.

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A New Functional Global Auto-ignition Model for Hydrocarbon Fuels - Part 2 of 2: Model Formulation, Development and Performance Assessment

Cited by 5 publications

References 35 publications

Global reaction mechanism for the auto-ignition of full boiling range gasoline and kerosene fuels

Global reaction mechanism for the auto-ignition of full boiling range gasoline and kerosene fuels

A CFD Study of Fuel Evaporation and Related Thermo-fluid Dynamics in the Inlet Manifold, Port and Cylinder of the CFR Octane Engine

A control-oriented combustion model framework for compression ignition engines operating on low-reactivity fuel

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